[Bug tree-optimization/92283] [10 Regression] 454.calculix miscomparison since r276645 with -O2 -march=znver2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92283

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Though with -O2 we should produce "exact" FP math (and vectorization is off).
So maybe we hit a latent issue after the extra unrolling from the rev. in
question.